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qntm's profile
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@qntm

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quarantine 'em

@qntm

I created the Antimemetics Division. http://scp-wiki.wikidot.com/antimemetics-division-hub …

qntm.org
Joined September 2009

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    1. quarantine 'em‏ @qntm 20 May 2017
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      Forget it, Jake. It's floating point > 999999999999999000000 999999999999999000000 > 999999999999999000000 % 1000000 951424

      4 replies 1 retweet 9 likes
    2. quarantine 'em‏ @qntm 20 May 2017
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      Replying to @qntm

      Why print "999999999999999000000" when the actual float is exactly 999999999999998951424? Why conceal those extra digits?

      6 replies 0 retweets 2 likes
    3. Adam Higerd‏ @codahighland 20 May 2017
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      Replying to @qntm

      The actual float is NOT exactly that value. It's that value +/- 2^20.

      1 reply 0 retweets 0 likes
    4. quarantine 'em‏ @qntm 20 May 2017
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      Replying to @codahighland

      No, the float is exactly that value.

      3 replies 0 retweets 0 likes
    5. Adam Higerd‏ @codahighland 20 May 2017
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      Replying to @qntm

      No, it really isn't. :P Any value in that range has the same floating-point representation. It's not 1:1.

      1 reply 0 retweets 0 likes
    6. quarantine 'em‏ @qntm 20 May 2017
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      Replying to @codahighland

      This value behaves like 999999999999998951424 when I do arithmetic with it. The value is 999999999999998951424.

      1 reply 0 retweets 0 likes
    7. Adam Higerd‏ @codahighland 20 May 2017
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      Replying to @qntm

      No it doesn't. It behaves like 9.99999999999999e+20. Try adding 1 to it.

      2 replies 0 retweets 0 likes
    8. quarantine 'em‏ @qntm 20 May 2017
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      Replying to @codahighland

      999999999999998951424 + 1 is 999999999999998951425. This value cannot be exactly represented so it takes the closest, 999999999999998951424

      1 reply 0 retweets 0 likes
    9. Adam Higerd‏ @codahighland 20 May 2017
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      Replying to @qntm

      That looks awfully like the behavior of 999999999999998951424 +/- 2^20 ;)

      1 reply 0 retweets 0 likes
      quarantine 'em‏ @qntm 20 May 2017
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      Replying to @codahighland

      (999999999999998951424 +/- 2^20) + 1 should yield 999999999999998951425 +/- 2^20

      4:21 PM - 20 May 2017
      1 reply 0 retweets 0 likes
        1. New conversation
        1. quarantine 'em‏ @qntm 20 May 2017
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          Replying to @qntm @codahighland

          The "error bar" you're describing is only in the result of the previous calculation (if any) which led to the current float

          1 reply 0 retweets 0 likes
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